The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 10 |
| 4 | 214 |
| 5 | 1946 |
| 6 | 10431 |
| 7 | 40561 |
| 8 | 127275 |
| 9 | 342434 |
| 10 | 820396 |
| 11 | 1794811 |
| 12 | 3649471 |
| 13 | 6986365 |
| 14 | 12714404 |
| 15 | 22162596 |
| 16 | 37221766 |
| 17 | 60519231 |
| 18 | 95631155 |
| 19 | 147337624 |
| 20 | 221925796 |
| 21 | 327546796 |
| 22 | 474632341 |
| 23 | 676377395 |
[0,1,10,214,1946,10431,40561,127275,342434,820396, 1794811,3649471,6986365,12714404,22162596, 37221766,60519231,95631155,147337624,221925796, 327546796,474632341,676377395] |